package com.example.forum.interceptor;

import com.example.forum.config.AppConfig;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import jakarta.servlet.http.HttpSession;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;

@Component
public class LoginInterceptor implements HandlerInterceptor {

    @Value("${forum.login.url}")
    private String defaultUrl;

    // 前置处理，对请求的预处理
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        HttpSession session = request.getSession();
        if(session != null && session.getAttribute(AppConfig.USER_SESSION) != null) {
            return true;
        }
        if(!defaultUrl.startsWith("/")) {
            defaultUrl = "/" + defaultUrl;
        }
        // 校验不通过，跳转到登录界面
        response.sendRedirect(defaultUrl);
        return false;
    }
}
